Simulation calculation method for contact resistance of isolating switch of gas insulated switchgear

Abstract

The invention relates to an isolation switch contact resistance simulation calculation method for gas insulated switchgear, and the method comprises the steps: simulating the assembly of a moving contact and a static contact through a preset angle type isolation switch simplified model of the gas insulated switchgear, and calculating the error distribution of the coaxiality of the moving contact and the static contact according to the distribution data; based on a preset disconnecting switch dynamic and static contact force-electricity coupling contact model of the gas insulated switchgear, calculating disconnecting switch contact resistance of the gas insulated switchgear; and determining the error range of the coaxiality of the moving contact and the static contact by using the error distribution of the coaxiality of the moving contact and the static contact, and simulating and calculating the change range of the contact resistance of the isolating switch of the gas insulated switchgear. By simulating the contact condition between the moving contact and the static contact in the GIS disconnecting switch, the contact resistance is calculated, the coaxiality error of the moving contact and the static contact is calculated, the tolerance matching design of the disconnecting switch is optimized, and the long-term reliable operation of the GIS is ensured.

Description

Technical Field

[0001] This application relates to the technical field of electrical equipment, and particularly relates to a simulation calculation method for the contact resistance of the disconnector in a gas-insulated switchgear. Background Art

[0002] The design and manufacture of GIS (GAS insulated SWITCHGEAR) are crucial for its operation reliability. It must withstand high voltage, large current, high mechanical stress, and extreme temperature rise under normal operating conditions and fault conditions for a long time, and ensure stable operation in a harsh environment. However, during the production and manufacturing process of GIS, due to factors such as insufficient machining accuracy and poor assembly process, the cooperation of key components inside the equipment may fail, leading to operation failures. Taking the disconnector in GIS as an example, the electrical contact between the moving and static contacts is realized through the finger contact structure inside. If the size of the finger contact of the static contact does not match or the contact is poor with the moving contact, it may lead to too large contact resistance and too high local temperature rise, ultimately resulting in the burning and current interruption of the contact part. Therefore, it is necessary to study the tolerance cooperation problem between the moving and static contacts considering the actual tolerance, and study the change of the contact resistance under the tolerance to improve the long-term stability of GIS operation. Currently, in the field of equipment manufacturing, tolerance analysis mainly adopts the computer-aided tolerance design (CAT) method. A tolerance model is established through equipment drawings and tolerance analysis software (such as 3DCS, GD&T Advisor) for tolerance analysis and dimension chain optimization; for the calculation of the contact resistance of the electrical connection structure of electrical equipment, numerical simulation calculations are mainly carried out using finite element simulation tools (such as COMSOL, ANSYS). Currently, for the tolerance analysis of GIS devices, more attention is paid to the analysis of the tolerance dimension chain of the operating mechanism, while less attention is paid to the cooperation problem between the moving and static contacts; for the calculation of the contact resistance of the disconnector in GIS, more research is on the contact resistance calculation under the finger contact structure, and mostly on the electrical contact phenomenon under the ideal size design, and less on the collaborative optimization method that comprehensively considers tolerance cooperation and electrical performance (such as contact resistance, temperature rise).

[0003] Therefore, it is necessary to establish a simulation calculation method for the contact resistance of the disconnector in GIS that comprehensively considers manufacturing tolerance and electrical performance to guide the manufacturing optimization of the disconnector in GIS and improve the long-term operation reliability of GIS. Summary of the Invention

[0004] This application provides a simulation calculation method for the contact resistance of the disconnector in a gas-insulated switchgear to solve the problems that the simulation calculation of the contact resistance of the disconnector in GIS in the related technology does not consider manufacturing tolerance and electrical performance, is difficult to guide the manufacturing optimization of the disconnector in GIS, and cannot improve the long-term operation reliability of GIS, etc.

[0005] The first aspect of the embodiments of the present application provides a method for simulating and calculating the contact resistance of the disconnector of a gas-insulated switchgear, including the following steps: using a preset simplified model of the angular disconnector of the gas-insulated switchgear to respectively simulate the assembly of the moving contact and the static contact to generate the distribution data of the gas-insulated switchgear, and calculating the error distribution of the coaxiality of the moving contact and the static contact according to the distribution data; based on the preset force-electric coupling contact model of the moving and static contacts of the disconnector of the gas-insulated switchgear, calculating the contact resistance of the disconnector of the gas-insulated switchgear; using the error distribution of the coaxiality of the moving contact and the static contact to determine the error range of the coaxiality of the moving contact and the static contact, and adjusting the geometric relationship between the moving contact and the static contact according to the error range, so as to simulate and calculate the change range of the contact resistance of the disconnector of the gas-insulated switchgear according to the geometric relationship.

[0006] Optionally, in an embodiment of the present application, the step of using a preset simplified model of the angular disconnector of the gas-insulated switchgear to respectively simulate the assembly of the moving contact and the static contact to generate the distribution data of the gas-insulated switchgear, and calculating the error distribution of the coaxiality of the moving contact and the static contact includes: establishing a preset simplified model of the angular disconnector of the gas-insulated switchgear based on the assembly sequence of the moving contact and the static contact; establishing a DCS model including at least one tolerance feature of point feature, line feature, surface feature and hole feature based on the preset simplified model of the angular disconnector; establishing the assembly relationship of the gas-insulated switchgear according to the actual assembly sequence of the disconnector based on the DCS model, and determining the virtual 3D assembly process of the gas-insulated switchgear according to the assembly relationship; adding at least one tolerance data of datum plane, flatness tolerance, position tolerance and parallelism tolerance based on the virtual 3D assembly process according to the equipment drawing of the gas-insulated switchgear; adding measurement targets based on the at least one tolerance data to perform Monte Carlo simulation assembly to obtain the distribution data of the measurement targets, and calculating the error distribution of the coaxiality of the moving contact and the static contact according to the distribution data.

[0007] Optionally, in an embodiment of the present application, calculating the isolation switch contact resistance of the gas-insulated switchgear based on the preset dynamic and static contact force-electrical coupling contact model of the isolation switch of the gas-insulated switchgear includes: establishing a simplified physical model of the dynamic and static contacts of the isolation switch of the gas-insulated switchgear based on the contact force update equation, dynamic penalty parameter adjustment equation, and contact force transfer equation of the gas-insulated switchgear; establishing a force-electrical coupling multi-physical field mathematical model of the dynamic and static contacts of the isolation switch of the gas-insulated switchgear according to the harmonic mean of the contact shrinkage conductivity and the contact surface conductivity of the gas-insulated switchgear; and simulating and calculating the force-electrical coupling multi-physical field of the dynamic and static contacts of the isolation switch of the gas-insulated switchgear based on the simplified physical model of the dynamic and static contacts of the isolation switch and the force-electrical coupling multi-physical field mathematical model of the dynamic and static contacts of the isolation switch, so as to determine the contact resistance of the gas-insulated switchgear according to the force-electrical coupling multi-physical field of the dynamic and static contacts of the isolation switch.

[0008] Optionally, in an embodiment of the present application, the contact force update equation is:

[0009]

[0010] where T n,j represents the normal contact force at the j-th iteration step, g n represents the normal gap, and p n is the dynamic penalty parameter;

[0011] The dynamic penalty parameter adjustment equation is:

[0012]

[0013] where E char is the characteristic energy of the material, h min is the minimum characteristic size related to the contact area in the model, and N cmp is the number of calculation iterations;

[0014] The contact force transfer equation is:

[0015] T n,j+1 = T np,j

[0016] where T np,j is the contact force update equation.

[0017] Optionally, in an embodiment of the present application, the calculation formulas for the harmonic mean of the contact shrinkage conductivity and the contact surface conductivity are respectively:

[0018]

[0019] Among them, h c is the contact shrinkage conductivity, p c is the contact pressure, H c is the hardness of the softer material among the two contact materials, σ u , σ d are the conductivities of the upper and lower contact materials respectively, σ contact is the harmonic mean of the contact surface conductivity, σ asp is the equivalent roughness of the contact surface, m asp is the equivalent slope of the contact surface.

[0020] In the second aspect of the embodiments of the present application, a simulation calculation device for the isolation switch contact resistance of a gas-insulated switchgear is provided, including: a simulation module, configured to use a preset angular isolation switch simplified model of the gas-insulated switchgear to respectively simulate the assembly of the moving contact and the static contact, so as to generate distribution data of the gas-insulated switchgear, and calculate the error distribution of the coaxiality of the moving contact and the static contact according to the distribution data; a calculation module, configured to calculate the isolation switch contact resistance of the gas-insulated switchgear based on a preset force-electric coupling contact model of the moving and static contacts of the isolation switch of the gas-insulated switchgear; a simulation calculation module, configured to use the error distribution of the coaxiality of the moving contact and the static contact to determine the error range of the coaxiality of the moving contact and the static contact, and adjust the geometric relationship between the moving contact and the static contact according to the error range, so as to simulate and calculate the change range of the isolation switch contact resistance of the gas-insulated switchgear according to the geometric relationship.

[0021] Optionally, in an embodiment of the present application, the simulation module includes: a first establishment unit, configured to establish a preset angular isolation switch simplified model of the gas-insulated switchgear based on the assembly sequence of the moving contact and the static contact; a second establishment unit, configured to establish a DCS model including at least one tolerance feature among point features, line features, surface features, and hole features based on the preset angular isolation switch simplified model; a determination unit, configured to establish the assembly relationship of the gas-insulated switchgear based on the DCS model according to the actual assembly sequence of the isolation switch, and determine the virtual 3D assembly process of the gas-insulated switchgear according to the assembly relationship; an addition unit, configured to add at least one tolerance data among a reference plane, flatness tolerance, position tolerance, and parallelism tolerance based on the virtual 3D assembly process according to the equipment drawing of the gas-insulated switchgear; a simulation unit, configured to add a measurement target based on the at least one tolerance data to perform Monte Carlo simulation assembly, obtain the distribution data of the measurement target, and calculate the error distribution of the coaxiality of the moving contact and the static contact according to the distribution data.

[0022] Optionally, in an embodiment of the present application, the calculation module includes: a third establishment unit configured to establish a simplified physical model of the moving and static contacts of the disconnector of the gas-insulated switchgear based on the contact force update equation, the dynamic penalty parameter adjustment equation, and the contact force transfer equation of the gas-insulated switchgear; a fourth establishment unit configured to establish a force-electricity coupling multi-physical field mathematical model of the moving and static contacts of the disconnector of the gas-insulated switchgear according to the harmonic mean of the contact shrinkage conductivity and the contact surface conductivity of the gas-insulated switchgear; a simulation calculation unit configured to simulate and calculate the force-electricity coupling multi-physical field of the moving and static contacts of the disconnector of the gas-insulated switchgear based on the simplified physical model of the moving and static contacts of the disconnector and the force-electricity coupling multi-physical field mathematical model of the moving and static contacts of the disconnector, so as to determine the contact resistance of the gas-insulated switchgear according to the force-electricity coupling multi-physical field of the moving and static contacts of the disconnector.

[0023] Optionally, in an embodiment of the present application, the contact force update equation is:

[0024]

[0025] Wherein, T n,j represents the normal contact force at the j-th iteration step, g n represents the normal clearance, and p n is the dynamic penalty parameter;

[0026] The dynamic penalty parameter adjustment equation is:

[0027]

[0028] Wherein, E char is the characteristic energy of the material, h min is the minimum characteristic dimension related to the contact area in the model, and N cmp is the number of calculation iterations;

[0029] The contact force transfer equation is:

[0030] T n,j+1 = T np,j

[0031] Wherein, T np,j is the contact force update equation.

[0032] Optionally, in an embodiment of the present application, the calculation formulas for the harmonic mean of the contact shrinkage conductivity and the contact surface conductivity are respectively:

[0033]

[0034] Wherein, h c is the contact shrinkage conductivity, pc is the contact pressure, H c is the hardness of the softer material among the two contact materials, σ u , σ d are the conductivities of the upper and lower contact materials respectively, σ contact is the harmonic mean of the contact surface conductivity, σ asp is the equivalent roughness of the contact surface, m asp is the equivalent slope of the contact surface.

[0035] An embodiment of the third aspect of the present application provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. The processor executes the program to implement a method for simulating and calculating the isolation switch contact resistance of a gas-insulated switchgear as described in the above embodiment.

[0036] An embodiment of the fourth aspect of the present application provides a computer-readable storage medium that stores a computer program, and when the program is executed by a processor, it implements the method for simulating and calculating the isolation switch contact resistance of a gas-insulated switchgear as described above.

[0037] An embodiment of the fifth aspect of the present application provides a computer program product that stores a computer program, and when the program is executed by a processor, it implements the method for simulating and calculating the isolation switch contact resistance of a gas-insulated switchgear as described above.

[0038] Embodiments of the present application can simulate the contact situation between the moving and static contacts in a GIS isolation switch through the finite element method, and indirectly calculate the magnitude of the contact resistance; through the simulation assembly method, calculate the coaxiality error between the moving and static contacts, and study the numerical change of the contact resistance under the coaxiality error, which is of great significance for optimizing the tolerance fit design of the isolation switch and ensuring the long-term reliable operation of the GIS. Thus, it solves the problems that the simulation calculation of the contact resistance of a GIS isolation switch in the related art does not consider manufacturing tolerances and electrical performance, is difficult to guide the manufacturing optimization of the GIS isolation switch, and cannot improve the long-term operation reliability of the GIS.

[0039] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present application will become apparent and easy to understand from the following description of the embodiments in conjunction with the drawings, where:

[0041] Figure 1 is a flowchart of a method for simulating and calculating the isolation switch contact resistance of a gas-insulated switchgear according to an embodiment of the present application;

[0042] Figure 2 It is a schematic structural diagram of a disconnector contact resistance simulation calculation device for a gas-insulated switchgear according to an embodiment of the present application;

[0043] Figure 3 It is a schematic structural diagram of an electronic device according to an embodiment of the present application. Specific embodiments

[0044] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application.

[0045] A method for simulating and calculating the contact resistance of a disconnector of a gas-insulated switchgear according to an embodiment of the present application will be described below with reference to the accompanying drawings. In view of the problem that the simulation calculation of the contact resistance of a GIS disconnector in the related art mentioned in the above background technology does not consider manufacturing tolerances and electrical performance, it is difficult to guide the manufacturing optimization of the GIS disconnector and cannot improve the long-term operation reliability of the GIS. The present application provides a method for simulating and calculating the contact resistance of a disconnector of a gas-insulated switchgear. In this method, the contact situation between the moving and static contacts in the GIS disconnector can be simulated by the finite element method, and the size of the contact resistance can be indirectly calculated; by the simulation assembly method, the coaxiality error between the moving and static contacts can be calculated, and the numerical change of the contact resistance under the coaxiality error can be studied, which is of great significance for optimizing the tolerance fit design of the disconnector and ensuring the long-term reliable operation of the GIS. Thus, the problems that the simulation calculation of the contact resistance of a GIS disconnector in the related art does not consider manufacturing tolerances and electrical performance, it is difficult to guide the manufacturing optimization of the GIS disconnector and cannot improve the long-term operation reliability of the GIS are solved.

[0046] Specifically, Figure 1 It is a schematic flow chart of a method for simulating and calculating the contact resistance of a disconnector of a gas-insulated switchgear provided by an embodiment of the present application.

[0047] As Figure 1 shown, the method for simulating and calculating the contact resistance of a disconnector of a gas-insulated switchgear includes the following steps:

[0048] In step S101, the assembly of the moving contact and the static contact is respectively simulated by using a preset angular disconnector simplified model of the gas-insulated switchgear to generate distribution data of the gas-insulated switchgear, and the error distribution of the coaxiality between the moving contact and the static contact is calculated according to the distribution data.

[0049] In the actual implementation process, the embodiments of the present application can carry out the simulation assembly of a simplified model of the disconnector of a gas-insulated switchgear (GIS) to generate distribution data of the gas-insulated switchgear, and calculate the error distribution of the coaxiality of the moving contact and the static contact based on the distribution data. By means of the simulation assembly method, calculating the coaxiality error of the moving and static contacts is conducive to studying the numerical change of the contact resistance under the coaxiality error.

[0050] Optionally, in an embodiment of the present application, the preset angular disconnector simplified model of the gas-insulated switchgear is used to simulate the assembly of the moving contact and the static contact respectively to generate distribution data of the gas-insulated switchgear, and the error distribution of the coaxiality of the moving contact and the static contact is calculated based on the distribution data, including: establishing a preset angular disconnector simplified model of the gas-insulated switchgear based on the assembly sequence of the moving contact and the static contact; establishing a DCS model including at least one tolerance feature of point feature, line feature, surface feature and hole feature based on the preset angular disconnector simplified model; establishing the assembly relationship of the gas-insulated switchgear according to the actual assembly sequence of the disconnector based on the DCS model, and determining the virtual 3D assembly process of the gas-insulated switchgear according to the assembly relationship; adding at least one tolerance data of datum plane, flatness tolerance, position tolerance and parallelism tolerance according to the equipment drawing of the gas-insulated switchgear based on the virtual 3D assembly process; adding measurement targets based on at least one tolerance data to perform Monte Carlo simulation assembly, obtaining the distribution data of the measurement targets, and calculating the error distribution of the coaxiality of the moving contact and the static contact according to the distribution data.

[0051] In the actual implementation process, the embodiments of the present application may include:

[0052] 1. Establish a simplified 3D physical model of the 550 kV GIS angular disconnector:

[0053] The original structure of the angular disconnector is relatively complex, such as the housing, pot insulator, support, bearing, shielding cover, insulating torsion bar, drive mechanism, and moving and static contacts, etc. There are many part tolerance data involved, which is not conducive to the simulation analysis. Therefore, a simplified model needs to be established. Considering the assembly sequence of the moving and static contacts, the main components affecting the concentricity of the moving and static contacts of the disconnector are the external housing and insulator, and the internal support and bearing. Other components are not important in the analysis.

[0054] 2. Establish a DCS model and import tolerance features

[0055] The features created on each component of the simplified model can include point features, line features, surface features, hole features, etc. The main purpose of this part of the work is to provide a model basis and reference for subsequent establishment of assembly relationships, input of tolerances, and creation of measurement targets.

[0056] 3. Establish a virtual 3D assembly process according to the assembly relationship

[0057] When establishing the assembly relationship, assemble according to the actual assembly steps of the disconnector: (1) Place the support body on the support body pot insulator; (2) Install the disconnector housing on the support body pot insulator; (3) Install the support on the support body; (4) Install the static contact side pot insulator. Since the installation order will affect the final simulation result, it is necessary to model according to the actual assembly order. When establishing the assembly relationship, mainly assemble based on the features established previously.

[0058] 4. Add tolerance data according to the equipment drawings

[0059] The tolerances of the input components include both dimensional tolerances and geometric tolerances. In this step, it is still possible to only add the tolerances that have an impact on the measurement results, and it is not necessary to add all the contents in the drawings. The tolerances mainly include datum planes, flatness tolerances, position tolerances, parallelism tolerances, etc.

[0060] 5. Add measurement targets and perform Monte Carlo simulation assembly

[0061] Convert the problem of non-concentric moving and static contacts into two aspects of assessment. On the one hand, assess based on features, and assess the coaxiality between the inner cylinder of the support and the inner wall of the positioning screw hole of the static contact; on the other hand, assess the distance between the point where the center line of the support extends to the edge of the static contact and the point where the center line of the static contact side pot insulator extends to the edge of the static contact. Use Monte Carlo simulation assembly to obtain the distribution data of the measurement targets.

[0062] In step S102, based on the preset force-electricity coupling contact model of the moving and static contacts of the disconnector in the gas-insulated switchgear, calculate the contact resistance of the disconnector in the gas-insulated switchgear.

[0063] In the actual execution process, the embodiment of the present application can analyze the preset force-electricity coupling contact model of the moving and static contacts of the disconnector in the gas-insulated switchgear, calculate the contact resistance of the disconnector in the gas-insulated switchgear, and indirectly calculate the magnitude of the contact resistance by simulating the contact situation between the moving and static contacts in the GIS disconnector.

[0064] Optionally, in an embodiment of the present application, based on the preset moving and static contact force - electro - coupling contact model of the disconnector of the gas - insulated switchgear, calculating the contact resistance of the disconnector of the gas - insulated switchgear includes: based on the contact force update equation, dynamic penalty parameter adjustment equation, and contact force transfer equation of the gas - insulated switchgear, establishing a simplified physical model of the moving and static contacts of the disconnector of the gas - insulated switchgear; according to the harmonic mean of the contact shrinkage conductivity and the contact surface conductivity of the gas - insulated switchgear, establishing a force - electro - coupling multi - physical field mathematical model of the moving and static contacts of the disconnector of the gas - insulated switchgear; based on the simplified physical model of the moving and static contacts of the disconnector and the force - electro - coupling multi - physical field mathematical model of the moving and static contacts of the disconnector, simulating and calculating the force - electro - coupling multi - physical field of the moving and static contacts of the disconnector of the gas - insulated switchgear, so as to determine the contact resistance of the gas - insulated switchgear according to the force - electro - coupling multi - physical field of the moving and static contacts of the disconnector.

[0065] In the actual execution process, the embodiment of the present application can establish a simplified physical model of the moving and static contacts of the disconnector of the gas - insulated switchgear based on the contact force update equation, dynamic penalty parameter adjustment equation, and contact force transfer equation of the gas - insulated switchgear, and establish a force - electro - coupling multi - physical field mathematical model of the moving and static contacts of the disconnector of the gas - insulated switchgear according to the harmonic mean of the contact shrinkage conductivity and the contact surface conductivity of the gas - insulated switchgear. The embodiment of the present application can simulate and calculate the force - electro - coupling multi - physical field of the moving and static contacts of the disconnector of the gas - insulated switchgear based on the simplified physical model of the moving and static contacts of the disconnector and the force - electro - coupling multi - physical field mathematical model of the moving and static contacts of the disconnector, and analyze the results, so as to determine the contact resistance of the gas - insulated switchgear according to the force - electro - coupling multi - physical field of the moving and static contacts of the disconnector.

[0066] For the mechanical contact between the moving and static contacts of the disconnector, the augmented Lagrangian method is used for processing. The augmented Lagrangian method combines the penalty function and the Lagrange multiplier method, and iteratively approximates the exact solution in stages.

[0067] Among them, in an embodiment of the present application, the contact force update equation is:

[0068]

[0069] Among them, T n,j represents the normal contact force at the j - th iteration step, g n represents the normal gap, p n is the dynamic penalty parameter. If there is no penetration (g n ≤0), the contact force decreases linearly, similar to the multiplier correction, to ensure that the contact force relaxes when there is no penetration. If penetration occurs (g n >0), an exponential penalty term is introduced to penalize the penetration calculation result, forcing the gap to tend to 0;

[0070] The dynamic penalty parameter adjustment equation is as follows:

[0071]

[0072] Among them, in the early iteration, the penalty parameter p n linearly increases with the number of iterations, gradually enhancing the penalty; in the later iteration, the penalty parameter p n saturates to 1 to avoid over-penalization, E char is the characteristic energy of the material, h min is the minimum characteristic size related to the contact area in the model, N cmp is the number of calculation iterations;

[0073] Transfer the updated contact force to the next iteration. The contact force transfer equation is:

[0074] T n,j+1 = T np,j

[0075] Among them, T np,j is the contact force update equation.

[0076] In the augmented Lagrangian method, first set the initial contact force, solve the contact surface spacing according to the current displacement, update the contact force in a piecewise manner according to the conditions and transfer the iteration. Adjust the penalty parameter p n . When the spacing g n meets the requirements or the change in the contact force is less than the threshold, it can be considered that the contact calculation result converges.

[0077] For the force-electricity coupling contact between the moving and static contacts of the disconnector, the Cooper-Mikic-Yovanovich correlation is used for processing. When two conductors are in contact, the actual contact area is much smaller than the apparent area, and the current lines contract near the contact points, resulting in an increase in the local resistance. The contact resistance includes the constriction resistance and the film resistance. The constriction conductivity is the derivative of the constriction resistance. The Cooper-Mikic-Yovanovich correlation is used to calculate the constriction conductivity between conductors.

[0078] Among them, in an embodiment of the present application, the calculation formulas for the harmonic mean of the contact constriction conductivity and the contact surface conductivity are respectively:

[0079]

[0080] Among them, h c is the contact constriction conductivity, with the unit of S / m; p c is the contact pressure, with the unit of Pa; H c is the hardness of the softer material among the two contacting materials, with the unit of Pa; σu , σ d are the electrical conductivities of the upper and lower contact materials respectively, with the unit of S / m; σ contact is the harmonic mean of the contact surface electrical conductivity, and σ asp is the equivalent roughness of the contact surface, with the unit of m; m asp is the equivalent slope of the contact surface. Substituting the material parameters, the contraction conductivity in the contact model can be obtained, and thus the contact resistance at the contact part can be calculated.

[0081] In step S103, the error range of the coaxiality between the moving contact and the static contact is determined by using the error distribution of the coaxiality between the moving contact and the static contact, and the geometric relationship between the moving contact and the static contact is adjusted according to the error range, so as to simulate and calculate the change range of the disconnector contact resistance of the gas-insulated switchgear according to the geometric relationship.

[0082] In the actual implementation process, the embodiments of the present application can carry out research on the change of the contact resistance of the GIS disconnector considering tolerances, determine the error range of the coaxiality between the moving contact and the static contact by using the error distribution of the coaxiality between the moving contact and the static contact, and adjust the geometric relationship between the moving contact and the static contact according to the error range, so as to simulate and calculate the change range of the disconnector contact resistance of the gas-insulated switchgear according to the geometric relationship, and can realize the simulation calculation of the contact resistance of the 550kV GIS disconnector considering the actual tolerances, which is of great significance for optimizing the tolerance fit design of the disconnector and ensuring the long-term reliable operation of the GIS.

[0083] According to a method for simulating and calculating the contact resistance of a disconnector of a gas-insulated switchgear proposed by an embodiment of the present application, the contact situation between the moving contact and the static contact in the GIS disconnector can be simulated by the finite element method, and the size of the contact resistance can be indirectly calculated; by the simulation assembly method, the coaxiality error between the moving contact and the static contact can be calculated, and the numerical change of the contact resistance under the coaxiality error can be studied, which is of great significance for optimizing the tolerance fit design of the disconnector and ensuring the long-term reliable operation of the GIS. Thus, the problem that the simulation calculation of the contact resistance of the GIS disconnector in the related technology does not consider the manufacturing tolerance and electrical performance, is difficult to guide the manufacturing optimization of the GIS disconnector, and cannot improve the long-term operation reliability of the GIS is solved.

[0084] Secondly, a device for simulating and calculating the contact resistance of a disconnector of a gas-insulated switchgear proposed by an embodiment of the present application is described with reference to the accompanying drawings.

[0085] Figure 2 is a schematic structural diagram of a device for simulating and calculating the contact resistance of a disconnector of a gas-insulated switchgear according to an embodiment of the present application.

[0086] As Figure 2As shown in the figure, the disconnector contact resistance simulation calculation device 10 of a gas-insulated switchgear includes: a simulation module 100, a calculation module 200, and a simulation calculation module 300.

[0087] Specifically, the simulation module 100 is used to respectively simulate the assembly of the moving contact and the static contact by using the preset angular disconnector simplified model of the gas-insulated switchgear to generate the distribution data of the gas-insulated switchgear, and calculate the error distribution of the coaxiality of the moving contact and the static contact according to the distribution data.

[0088] The calculation module 200 is used to calculate the disconnector contact resistance of the gas-insulated switchgear based on the preset force-electric coupling contact model of the moving and static contacts of the disconnector of the gas-insulated switchgear.

[0089] The simulation calculation module 300 is used to determine the error range of the coaxiality of the moving contact and the static contact by using the error distribution of the coaxiality of the moving contact and the static contact, and adjust the geometric relationship between the moving contact and the static contact according to the error range, so as to simulate and calculate the change range of the disconnector contact resistance of the gas-insulated switchgear according to the geometric relationship.

[0090] Optionally, in an embodiment of the present application, the simulation module 100 includes: a first establishment unit, a second establishment unit, a determination unit, an addition unit, and a simulation unit.

[0091] Among them, the first establishment unit is used to establish the preset angular disconnector simplified model of the gas-insulated switchgear based on the assembly sequence of the moving contact and the static contact.

[0092] The second establishment unit is used to establish a DCS model including at least one tolerance feature of point feature, line feature, surface feature, and hole feature based on the preset angular disconnector simplified model.

[0093] The determination unit is used to establish the assembly relationship of the gas-insulated switchgear based on the DCS model according to the actual assembly sequence of the disconnector, and determine the virtual 3D assembly process of the gas-insulated switchgear according to the assembly relationship.

[0094] The addition unit is used to add at least one tolerance data of datum plane, flatness tolerance, position tolerance, and parallelism tolerance based on the virtual 3D assembly process according to the equipment drawing of the gas-insulated switchgear.

[0095] The simulation unit is used to add measurement targets based on at least one tolerance data for Monte Carlo simulation assembly, obtain the distribution data of the measurement targets, and calculate the error distribution of the coaxiality of the moving contact and the static contact according to the distribution data.

[0096] Optionally, in an embodiment of the present application, the calculation module 200 includes: a third establishment unit, a fourth establishment unit, and a simulation calculation unit.

[0097] The third establishment unit is configured to establish a simplified physical model of the moving and static contacts of the disconnector of the gas-insulated switchgear based on the contact force update equation, the dynamic penalty parameter adjustment equation, and the contact force transfer equation of the gas-insulated switchgear.

[0098] The fourth establishment unit is configured to establish a force-electricity coupled multi-physical field mathematical model of the moving and static contacts of the disconnector of the gas-insulated switchgear according to the harmonic mean of the contact shrinkage conductivity and the contact surface conductivity of the gas-insulated switchgear.

[0099] The simulation calculation unit is configured to simulate and calculate the force-electricity coupled multi-physical field of the moving and static contacts of the disconnector of the gas-insulated switchgear based on the simplified physical model of the moving and static contacts of the disconnector and the force-electricity coupled multi-physical field mathematical model of the moving and static contacts of the disconnector, so as to determine the contact resistance of the gas-insulated switchgear according to the force-electricity coupled multi-physical field of the moving and static contacts of the disconnector.

[0100] Optionally, in an embodiment of the present application, the contact force update equation is:

[0101]

[0102] where T n,j represents the normal contact force at the j-th iteration step, g n represents the normal gap, and p n is the dynamic penalty parameter;

[0103] The dynamic penalty parameter adjustment equation is:

[0104]

[0105] where E char is the characteristic energy of the material, h min is the minimum characteristic size related to the contact area in the model, and N cmp is the number of calculation iterations;

[0106] The contact force transfer equation is:

[0107] T n,j+1 = T np,j

[0108] where T np,j is the contact force update equation.

[0109] Optionally, in an embodiment of the present application, the calculation formulas for the harmonic mean of the contact shrinkage conductivity and the contact surface conductivity are respectively:

[0110]

[0111] Among them, h c is the contact shrinkage conductivity, p c is the contact pressure, H c is the hardness of the softer material among the two contact materials, σ u , σ d are the conductivities of the upper and lower contact materials respectively, σ contact is the harmonic mean of the contact surface conductivity, σ asp is the equivalent roughness of the contact surface, m asp is the equivalent slope of the contact surface.

[0112] It should be noted that the foregoing explanation of the embodiment of the simulation calculation method for the disconnector contact resistance of a gas-insulated switchgear also applies to the simulation calculation device for the disconnector contact resistance of a gas-insulated switchgear in this embodiment, and will not be elaborated here.

[0113] A simulation calculation device for the disconnector contact resistance of a gas-insulated switchgear proposed according to an embodiment of the present application can simulate the contact situation between the moving and static contacts in the GIS disconnector through the finite element method, and indirectly calculate the magnitude of the contact resistance; through the simulation assembly method, calculate the coaxiality error between the moving and static contacts, and study the numerical change of the contact resistance under the coaxiality error, thereby having important significance for optimizing the tolerance fit design of the disconnector and ensuring the long-term reliable operation of the GIS. Thus, the problem that the simulation calculation of the contact resistance of the GIS disconnector in the related technology does not consider the manufacturing tolerance and electrical performance, and it is difficult to guide the manufacturing optimization of the GIS disconnector and improve the long-term operation reliability of the GIS is solved.

[0114] Figure 3 The structural schematic diagram of the electronic device provided by the embodiment of the present application. The electronic device may include:

[0115] A memory 301, a processor 302, and a computer program stored on the memory 301 and executable on the processor 302.

[0116] When the processor 302 executes the program, it implements the simulation calculation method for the disconnector contact resistance of a gas-insulated switchgear provided in the above embodiment.

[0117] Further, the electronic device further includes:

[0118] A communication interface 303 for communication between the memory 301 and the processor 302.

[0119] The memory 301 is used to store a computer program executable on the processor 302.

[0120] The memory 301 may include high-speed RAM memory and may also include non-volatile memory, such as at least one disk memory.

[0121] If the memory 301, the processor 302, and the communication interface 303 are implemented independently, the communication interface 303, the memory 301, and the processor 302 can be interconnected through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 3 only a thick line is used to represent it in the figure, but it does not mean that there is only one bus or one type of bus.

[0122] Optionally, in a specific implementation, if the memory 301, the processor 302, and the communication interface 303 are integrated on a chip, the memory 301, the processor 302, and the communication interface 303 can communicate with each other through an internal interface.

[0123] The processor 302 may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0124] This embodiment also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the method for simulating and calculating the disconnector contact resistance of a gas-insulated switchgear as described above.

[0125] The embodiments of the present application also provide a computer program product, on which a computer program is stored. When the program is executed by a processor, it implements the method for simulating and calculating the disconnector contact resistance of a gas-insulated switchgear as described above.

[0126] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0127] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0128] Any process or method description depicted in a flowchart or otherwise described herein can be understood to represent a module, segment, or portion of code including one or N executable instructions for implementing a customized logic function or process, and the scope of the preferred embodiments of this application includes additional implementations, where the functions can be executed in a manner that is not in the order shown or discussed, including in a substantially simultaneous manner according to the functions involved or in a reverse order, which should be understood by those skilled in the art to which the embodiments of this application pertain.

[0129] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, which can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or used in combination with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion (electronic device) having one or N wirings, a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then storing it in a computer memory.

[0130] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0131] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0132] In addition, each functional unit in various embodiments of the present application may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0133] The above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disc, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A simulation calculation method for the contact resistance of the disconnector in a gas-insulated switchgear, characterized in that, Including the following steps: Using a simplified model of a preset angular disconnector of a gas-insulated switchgear to simulate the assembly of the moving contact and the static contact respectively, so as to generate distribution data of the gas-insulated switchgear, and calculating the error distribution of the coaxiality of the moving contact and the static contact according to the distribution data; Based on the preset moving and static contact force-electricity coupling contact model of the disconnector of the gas-insulated switchgear, calculating the contact resistance of the disconnector of the gas-insulated switchgear; Using the error distribution of the coaxiality of the moving contact and the static contact to determine the error range of the coaxiality of the moving contact and the static contact, and adjusting the geometric relationship between the moving contact and the static contact according to the error range, so as to simulate and calculate the change range of the contact resistance of the disconnector of the gas-insulated switchgear according to the geometric relationship.

2. The method according to claim 1, wherein The step of using a simplified model of a preset angular disconnector of a gas-insulated switchgear to simulate the assembly of the moving contact and the static contact respectively, so as to generate distribution data of the gas-insulated switchgear, and calculating the error distribution of the coaxiality of the moving contact and the static contact according to the distribution data includes: Based on the assembly sequence of the moving contact and the static contact, establishing a simplified model of a preset angular disconnector of the gas-insulated switchgear; Based on the simplified model of the preset angular disconnector, establishing a DCS model including at least one tolerance feature among point features, line features, surface features and hole features; Based on the DCS model, establishing the assembly relationship of the gas-insulated switchgear according to the actual assembly sequence of the disconnector, and determining the virtual 3D assembly process of the gas-insulated switchgear according to the assembly relationship; Based on the virtual 3D assembly process, adding at least one tolerance data among a datum plane, flatness tolerance, position tolerance and parallelism tolerance according to the equipment drawing of the gas-insulated switchgear; Based on the at least one tolerance data, adding measurement targets to perform Monte Carlo simulation assembly, obtaining the distribution data of the measurement targets, and calculating the error distribution of the coaxiality of the moving contact and the static contact according to the distribution data.

3. The method according to claim 1, wherein The step of calculating the contact resistance of the disconnector of the gas-insulated switchgear based on the preset moving and static contact force-electricity coupling contact model of the disconnector of the gas-insulated switchgear includes: Based on the contact force update equation, dynamic penalty parameter adjustment equation and contact force transfer equation of the gas-insulated switchgear, establishing a simplified physical model of the moving and static contacts of the disconnector of the gas-insulated switchgear; According to the harmonic mean of the contact shrinkage conductivity and the contact surface conductivity of the gas-insulated switchgear, establishing a force-electricity coupling multi-physical field mathematical model of the moving and static contacts of the disconnector of the gas-insulated switchgear; Based on the simplified physical model of the moving and static contacts of the disconnector and the force-electricity coupling multi-physical field mathematical model of the moving and static contacts of the disconnector, simulating and calculating the force-electricity coupling multi-physical field of the moving and static contacts of the disconnector of the gas-insulated switchgear, so as to determine the contact resistance of the gas-insulated switchgear according to the force-electricity coupling multi-physical field of the moving and static contacts of the disconnector.

4. The method according to claim 3, characterized in that, The contact force update equation is: Among them, T n,j represents the normal contact force at the j-th iteration step, and g n represents the normal clearance, and p n is the dynamic penalty parameter; The dynamic penalty parameter adjustment equation is as follows: Among them, E char is the characteristic energy of the material, h min is the minimum characteristic size related to the contact area in the model, N cmp is the number of calculation iterations; The contact force transfer equation is as follows: T n,j+1 = T np,j where T np,j is the contact force update equation.

5. The method according to claim 3, characterized in that, The calculation formulas for the harmonic mean of the contact shrinkage conductivity and the contact surface conductivity are respectively: Among them, h c is the contact shrinkage conductivity, p c is the contact pressure, H c is the hardness of the softer material among the two contact materials, σ u , σ d are the conductivities of the upper and lower contact materials respectively, σ contact is the harmonic mean of the contact surface conductivity, σ asp is the equivalent roughness of the contact surface, m asp is the equivalent slope of the contact surface.

6. A simulation calculation device for the contact resistance of a disconnector in a gas-insulated switchgear, characterized in that, including: A simulation module, configured to respectively simulate the assembly of the moving contact and the static contact by using a preset angular disconnector simplified model of the gas-insulated switchgear to generate distribution data of the gas-insulated switchgear, and calculate the error distribution of the coaxiality between the moving contact and the static contact according to the distribution data; A calculation module, configured to calculate the disconnector contact resistance of the gas-insulated switchgear based on a preset dynamic and static contact force-electric coupling contact model of the disconnector of the gas-insulated switchgear; A simulation calculation module, configured to determine the error range of the coaxiality between the moving contact and the static contact by using the error distribution of the coaxiality between the moving contact and the static contact, and adjust the geometric relationship between the moving contact and the static contact according to the error range, so as to simulate and calculate the change range of the disconnector contact resistance of the gas-insulated switchgear according to the geometric relationship.

7. The device according to claim 6, characterized in that, The simulation module includes: A first establishment unit, configured to establish a preset angular disconnector simplified model of the gas-insulated switchgear based on the assembly sequence of the moving contact and the static contact; A second establishment unit, configured to establish a DCS model including at least one tolerance feature of a point feature, a line feature, a surface feature, and a hole feature based on the preset angular disconnector simplified model; A determination unit, configured to establish the assembly relationship of the gas-insulated switchgear based on the DCS model according to the actual assembly sequence of the disconnector, and determine the virtual 3D assembly process of the gas-insulated switchgear according to the assembly relationship; An addition unit, configured to add at least one tolerance data of a datum plane, flatness tolerance, position tolerance, and parallelism tolerance based on the virtual 3D assembly process according to the equipment drawing of the gas-insulated switchgear; A simulation unit, configured to add a measurement target based on the at least one tolerance data to perform Monte Carlo simulation assembly, obtain the distribution data of the measurement target, and calculate the error distribution of the coaxiality between the moving contact and the static contact according to the distribution data.

8. An electronic device, characterized in that, including: A memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor executes the program to implement a method for simulating and calculating the disconnector contact resistance of a gas-insulated switchgear according to any one of claims 1-5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, This program is executed by the processor to be used for implementing a method for simulating and calculating the disconnector contact resistance of a gas-insulated switchgear according to any one of claims 1-5.

10. A computer program product, comprising a computer program, characterized in that, The computer program is executed to be used for implementing a method for simulating and calculating the disconnector contact resistance of a gas-insulated switchgear according to any one of claims 1-5.

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